Pitman



Jul 14, 1925.

M. RICHEY PI'ITMAN Filed Feb. 28, 1924 2 Sheets-Sheet l July 14, 1925.

M. RlCHEY PITMAN 2 Sheets-Sheet 2 Filed Feb. 28, 1924 Patented July 14, 1925.

MARION RIC'HEY, OF EDAISLETTHA, TEE CAS.

Apnlieatien ,fiieddfebruary 28, t seiial .No. 635,830.

To all whom it may congem:

Be it known that '1, MARIQN Bier-my, a citizen of the United States," residing at Daisetta, .inithe county v of Liberty and of Texas, Thaye invented certain new and useful lfmproyemef tsin a .Pitmzih, pi which the following'is a specification.

his invention relates to ne\ v and useiful improvements in,a ,pitman. One object of the invention ;is to provide a pitman, ofthe,characteredescribed, which may be .readily released from the {driving crank arm wheneveroccasion[arises making it necessary, ordesirable, to disengage, pitman ;fro1nsaid arm.

Another objectoi'the invention is .to provide a pitman which isof simple constructime d m y b heaply and eas l P duced and which is very effective for ,the purposes intended.

'With the above and other objects in view, this invention has particular relation. tocertain novel-teatur'es o f construction, operation and arrangement oi parts, an-eirample of which is given in .this specification and illustrated in the accompanying drawings Whereinz- Figure 1 shows ,a side .vi ofagglerri and pum p associated therewith, showing the pitman connecting thewalking beam to the power.

Figure 2 shows anenlargedside view of the pitman, partly in seetipn.

Figure 3 shows one end of the pitman with the stirrup through which it is connected to the walking beam; and,

Figure 4: shows a sectional view taken on.

the line t-l of Figure 2.

In the drawings the numeral 1 designates the derrick having the floor 2. The numeral 3 designates the well casing in which the pump rod t works. A walking beam 5 is mounted on the post 6, and one end of it is connected to the pump rod 4. Power is transmitted through the belt 7 which drives the pulley 8. This pulley is mounted to rotate in a suitable frame 10 and one end of its shaft has a crank arm 11 whose free end is formed with a crank pin 12. This pin is connected to the other end of the walking beam through the pitman, now to be described. This pitman has the side members 13, 13, formed of channel irons which are suitably secured together at one end and bolted to said end there is the stirrup 14 which receives the corresponding end resilient seatsforthe bearing cap 23, and

tubing 3 and this clamp will now sustain the of the walking beam. Between the other ends; of the, side members 113 there is secured a s't'ationaryblock "1'5 and abovefit there isthe slidable bearing block 16 whose ends movel-in the channels of-said side members. Guides 17, 17 depend from the respective ends of the hearing block {and work in guide ways 18, 1 8,of the stationary block to .iholdsai'd blocks in alignment. A jack screw 19 is threadedthrough the block15 and its upper end' has a sw'ivelling connection with the movable bearing block. This screw has an enlarged head 20 onwhich theblock 16frests and said head isprovided with so-ckets 21 to receive a rod by means of which the screw 19 may be turned. i

The upper side of the block 16 has a concave'd bearing notch 22, to receivethe pin 12, and mounted upon itis the"bearing cap 23. The ends of 7 this cap have hearings to receive the studbolts 24",24,whichstand from the bearing block '16. Coil springs 25, 25, surround said" stud bolts and' form said cap is retained against detachment by the nuts 26, I I

Whilejthe'pump is operating, under normal conditionstheblock l6 'i's seated on the stationaryblock '15, the nut"27= on fthe"'scr ew 19' resting also on said stationary .blockand sustaining partoftheload.

' iIt often happensthat the belt 7 comes oii'of the dILivepiilleyB. "such case the weight ofthe pump rod's will carrythe corresponding end of the walking beam down until it is stopped by the stop 28. The pump will, of course, remain idle until the belt is replaced, and with the type of pitman now in common use, this cannot be done, by a single attendant, and consequently the pump remains idle until a sufficient force is obtained to turn the pulley 8 with the weight 01": the pump rods thereon. In this case, with my improved type of pitman, a rod is inserted in the socket 21, and the jack screw 19 turned. This will operate to pull the corresponding end of the walking beam down, the pitman parts assuming the position shown in Figure 2. The other end of the walking beam, with the pump rod, will be elevated correspondingly and when elevated a clamp 29 may be secured on the rod 4 immediately above the well weight of the pump rod and relieve the walking beam of said weight. This will free the wrist pin 12 of the load and the pitman may be readily disconnected therefrom in the usual way and the pulley then easily turned in order to replace the thrown belt. lVhen this is done, the pitman is reconnected to the wrist pin 12 and the jack screw turned in the other direction, toseat the bearing block 16 on the stationary block 15, and the clamp 29 removed, and pumping operations again started. This work can be done by the single attendant with very little labor and small loss of time.

Wmt I claim is 1. A pitman formed of side members secured together at one end and spaced apart at the other end, a stationary anchor between said spaced ends, a jack screw threaded through said anchor, a bearing block movable lengthwise betweensaid side members with which said jack screwhas a swiveling connection, a bearing cap mounted on said block and provided with end bearings, stud bolts secured to the block and fitted through said bearings, means preventing the detachment of said bearing cap from said stud bolts, yieldable members interposed between said bearing cap and said block, said cap and block having registering notches forming a wrist pin bearing.

2. A pitman formed with side members secured together at one end, a stirrup fastened to said end, the other ends of said side members being spaced apart, an anchor secured between said spaced ends, a jack screw threaded-through said anchor, a bearing block between said side membersand longitudinally movable with respect thereto, guides adapted to hold said block in alignment with said anchor, said jack screw forming a support for said block, a bearing cap formed with end bearings, stud bolts fixed to said block and working through said bearings, nuts threaded onto said stud bolts and holding said cap against detachment, said cap and block having registering notches forming a wrist pin bearing.

3. A pitman having spaced side members, a stationary anchor between said side members at one end, a jack screw having a threaded connection with said anchor, a bearing block movable lengthwise between said side members with which said jack screw has a swiveling connection, a lock nut on the jack screw adapted to abut against said anchor, a bearing cap mounted on said block, means preventing. the detachment of said bearing cap from said block,said means also constituting a guide for holding said cap in alignment with said block, said cap and block having registering notches forming a wrist-pin bearing.

4. A pitman having spaced side members, a stationary anchor between said side members at one end, a jack screw having a threaded connection with said anchor, a bearing block movable lengthwise between said side members with which said jack screw has an operative connection, a bearing cap mounted on said block, means preventing the detachment of said bearing cap from said block, said means also constituting a guide for holding said cap in alignment with said block, said cap and block having registering notches forming a wristpin bearing, and yieldable means interposed between said bearing block and cap.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARION RIGHEY.

Witnesses:

GLovIs MORGAN, E. A. JoHNsoN. 

